Grubber or cultivator



l 1,640,811 Aug. 30 l927 G K sPlTZENBERG GRUBBER 0R cULTxvATon Filed Feb.24, 192s 2 sheets-snee; 1.

1,640,811 Aug 30 1927' G. K. SPITZENBERG GRUBBER 0R GULTIVATOR Filed Feb.24. 1925 2 Sheets-Sheet 2 Patented Aug. 30, 1927.

narran STATES pari-mrorrica.

GEORG "KARL SPITZENBERG, "or ZACKE'RCK GERMANY.

My invention relates to improvements in grubbers or cultivators to be used in forestry, agriculture and horticulture, and more particularly in the construction 'of the blades of the grubberv or cultiva-tor. `The object of the improvementsis to provide a ic'ultivator by meai'is of which the soil is madeloose, pu-lverized and mixed, and in which thev lower portions are slightly compressed, lwhile a layer 'of loose soi-l is spread on the surface of the land. l have -ioundithat by thus preparing the soil land providing a slightlyv compressedbottom layer the Vmoisture is held within the loose soil,-and ythat the loose soil 'spread on the surface prevents evaporation. Further the holes l 'made in the,y land by the blades and loosely filledVK with soil insure aeration of the soil. With these objects` in view my invention consists,-

-in the 'construction of Vthe :grubber blades described hereinafter and particularly .pointed out inthe appended claims.

vFor the purpose of Yexplaining the invention several examples embodying the same f have-been shown in the accompanying drawings inwhich the same referencev 'characters have been used in all-:the views to` indicate` corresponding parts. In said drawings, v

` Fig. 1,7is an elevationoil the cultivator, Fig. 2, is a top plan v-iewthereof, Fig. 3, is a partial 'end viewof Fig. 1, Fig. 4,- is an eleva-tion showing-a modification, f l. Fig. 5, is a top-plan view lof Fig. 4, Figs. '6 and r(,"are respectively anfend view and an elevation showing a modification of the cultivator, i l

qFig. 8', is a perspective view showing the blade f f f- -F 9, is an elevation of the blade look? ing in the direction of the-movement thereof, Fig. l0, is an end view' looking .from the rightin Fig. 9, I, Q. Y Fig. 11, is a top plan view of the blade. and f'. Fig. 12, is a. section on theline 12-#12 of Fig. 10.

y In order that invention be clearlyjunf derstood vl shall at `first describe vvarious. types of cultivators or. grubbers provided with my improved blades.y In. the example Y shown 1in Figs. l to f3, the cultivator con-jl sists wheeled frame i" having a` pole GRUBBE'R on oULTWATn.

i Application Ifed VFebruar-$7 '24, v1925, Serial No. 10,998, and in Germany February 29, 1924. y y

and chains a attached thereto or provided lwithrneansfor attaching the same torme- -chanica-l traction means. On the said frame a drum 'o-,isrotatable lwhich is provided lwith a plurality of circumferential series vof main blades Va and, subsidiary blades b, thefseries of V'mai-n and subsidiary blades ,a and?) being valternatelyarranged on the drum. ,The axle le :ofgthedrum' is rotatably .mounted atits ends in sleeves m. made Vintegral with cranks turning the sleeves m ,andthe cranks .7c the .position of the wheels relatively to the drum c may be varied Jfor varying the 'depth Y 'to which the soil ,is grubbed or for raising the drum andits blades off the ground Vwhen driving on roads.

in the modifications Shown ifi rigs. and

5 the cultivator consists of three sectional .cultivators each 'comprising a frame r1, 1'2, r3,

respectively, and rotary grubberf members whw?, fw?, respectively, two of the said sectional ;cultivators andv 7' ybeing attached by'chain linksf or thelike to opposite sides of theme'mber 1P-1..; The .cu'ltivator members .fwlf, wg, w3 .consists ojfindividual sleeves rof tatably lmounted 'on theshaftsel, 2,63 and having thel'blades-cmade integral therewith. I-ngFigs. (iand 7 I have shown aY cultivator adapted to be dragged by hand and comyprising a yokel having a .polet' secured thereto. The armsvvof ythe lyoke a are con-v Vnecjtedby an axle et `having yseries of main and subsidiary blades o and 'fb rotatably mounted thereon, the construction. oft-he I The construction oikftlfi'e main' A.blades a has 'beenls'hown in detailin Figs.`- 8 yto 12.

' The' `blade a o'nsistsof an outer atportion al :reduced in Widthfromits A inner end towards its outerend4 and having asharp edge az-fa-l-y-d located lsubstantially in "th'e ydirecmain blades a being similar tothat ofthe tionV ,ofl the 4,rotary movementl ofthe blade, i'

which directionhas been indicated FiUs.

1l andi-2 by'an arrowr Y. At its sides tfge said portion. isy curved klarallfyj Y x l l opposite "directions fas to provide a similar' les.

in form to a helicoid, and the saidsides are made intcgr'al'each with a shank a4 and a5 of oblong section and formed at its front and rear with edges a and a?. At their bottom ends the said shanks are connected by a foot plate a8 provided with twobores a9 for the passage Vof bolts therethrough, said bolts being used for securing the blade to the drum c shown in Figs. 1 to 3. If the blades are provided on sleeves in the manner described` with reference to Figs. A t0'7, the foo-t plate a? is omitted. Itwill be seen that the two shanksat, as being located laterally of each other, rotate in different paths, and moreover, one of these shanks is in advance of o the other.

When the blade ispassed Vinto the ground the 'edges @Lula3 and @6,06 cut through the grass and the like. By reason of the curved form of the blade the loosened soil vis slightly compressedV at 'its bottom part,

-so that it is adapted to hold-` the water therein;

Inthe operation` of the cultivator the drum cor otherblade carrierisrotated so that the blades engage'the soil at first onlyV with their points, Vwhereupon they are gradually pressed into the same. Then the blades are thus forced into the soil parts of the latter fall into the open portionsof the blades, thus reducing 'the resistance of the blades within the soil and the power required vfor 'movingz the cultivator. The

blades produce comparatively deep holes in the soil and whenretrac'tfed therefrom they carry 'along the portions of they soil gathered p within their open parts w, which portions are spread onfthe surface-'of the land and cover the holes made bythe blades. Therefore the' moisture Yis held within the loose y layer of the soil, and -further the air has ence has been made to a particular example embodying the lsam'eI wish it tobe under-` access to the` said soil through the holes Y' inadethereinV by theblades and looselyilled ,and covered "with 'the loose soil raised-by the open portions In some cases v Y the rear of the cultivator forv further pulverizing the' loose surface of the land and leveling theV same. It will be `understood that thesaid harrow is not used for example when preparing the soil in winter time,

when it is desired to have an irregular sur-A face exposed to the action of thefrost.` f Preferably the cultivator is provided with 'elastic' clearing members p adapted to ref moveweed's, moss or grassv from the blades. Ln some cases vwhere the tractlonpowerlis sutlcientkl attach other implements, suchas l grubbers, harrows 'and the like, tothe'cultivator,'for which purpose the frame is provided with a'tractiony yoke I i I Y While in describing the invention refer-v stood that myinvention is not limited to I 'provide a harrow g lat 'body portion.l

the construction of the blade Vshown in the drawings and that various changes may be made in the form of the `blade without def each-other so that they will rotate in different paths.

'2. A rotary grubbing member provided with grubbing blades each' ofwhich has twol shanks connected at their outer ends byan outwardly tapering flatfportion and spaced at their .body portions, the body portions of Vsaidtwo shanks being located laterally of eachother so Vthat they will rotate in different paths, and one ofsuch body portions being located in advance ofthe other.

3. A Vrotary grubbing member provided with grubbing blades each of which has two shanks connected atntheir outerrends by an outwardly tapering flat portion and spCd;

at-ztheir bodyfportions, each of -saidshanks i having operative edges both at the front and at the rear of its body portion.

4. A rotaryvrgrubbing member provided with grubbing blades, each blade being formed at its outer part withan edge running substantially iny the direction of the movement of theA blade and with helical shanks beginning from the said outer part and curved'thcrefrom in lateral direction and having their inner endsplaced one behind the other inthe direction ofthe -movement of the blade, and saidy shanks being provided withedges'located substantially in the direction of the movementofthe blade;

5. vA rotaryY grubbing memberprovided 'Y with main grubbing blades, each blade being formed lat its -outer' part'with an edge running substantially 'in the direction vof the shanksfbeginning from the said outer part and curved therefrom-in `lateral direction and having theirinnerk ends placed one behind the other in the direction of the. movement of the blade, and said-shanks being provided with edges located substantially in the direction ofthe movement ofY the-blade, and subsidiary blades disposed circumferentially of said .rotary grubber member and laterally'of saidmain blades.

lli)

kmovement of the blade and with Jhelical 8. A yrotary grubbing member provided with grubbing blades each of which has 'two kshanks 'connected attheir outer ends by an outwardly tapering flat-Lportion and spaced f at their'body portions, :each of said shanks' havinganoperative edge at the rear of its V7. A: rotary grubbing memberA provided with grubbing blades each of which has two shanks connected at their outer ends by an outwardly tapering fiat portion and spaced at their body portions, each of said Shanks having an operative edge at the frontof iti 5 body portion.

8. A rotary grabbing member provided with grubbing blades each of which has two Shanks connected at their outer ends by an outwardly tapering Hat portion and spaced at their body portions.

In testimony whereof, I hereunto alTiX my signature.

GEORG KARL SPITZENBERG. 

